ECOLOGICAL SEWAGE WATER TREATMENT FACILITY FOR THE CONSTRUCTION CAMP OF COMPAÑÍA MINERA ZALDIVAR LTD. General Location. Compañía Minera Zaldívar is located in the Region of Antofagasta, 1400 km from Santiago de Chile and 175 km southeast of the Capital of the Region of Antofagasta.

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Main facilities are: Primary/Secondary Crushing Plant to produce a P80 of 40 mm. Subsequent classification in screens. Oversize is sent to WF Tertiary Crushers that produce ore with P80 of 11 mm, which is sent to double deck screen with the fine fraction sent to flotation. After dewatering, oversize is sent to stacking to feed the dynamic leach pad.

Ore stacked has a grain size 100% below 16 mm with a maximum fines ratio of 11%. The leach pad is of dynamic characteristics with a leach cycle of approximately 350 days.

Bioleach (bacterial leach) is done at the dynamic pad to dissolve the copper content both from oxide and sulfide ore.

There are two other types of leach pads: Secondary High Grade Spent Ore (RAL) and ROM Dump Leach.

Subsequent to leaching, leach solution of 3 to 4 g of Cu/L is sent to solvent extraction where copper increases to 46 or more grams of Cu/L that will be subsequently deposited in stainless steel plates through electro-winning to produce high purity copper cathodes.

For more than 10 years, waste water disposal process was carried out at Minera Zaldívar, through primary anaerobic process of solid-liquid separation, denominated septic tank, and subsequent transport of clear water to an infiltration camp with the subsequent loss of resource which, given its chemical and biological characteristics, made reutilization impractical.

Our commitment to responsible use of natural resources has led Compañía Minera Zaldívar to implement an innovative wastewater treatment process, whose main virtue is being an ecological treatment system, of low investment and operating cost.

The wastewater treatment plant, which was developed in cooperation with the Found for Technology Transfer of Universidad de Chile (Untec) corresponds to what is technically denominated a "Dynamic Aerobic Bio-filter" or “Earthworm Filter” ("Lombrifiltro)."

Waste water treatment consists of a series of physical, chemical and biological processes intended to remove contaminants present in water. The intent of the treatment process is to produce clean water (or treated effluent) that can be re-used environmentally.